Electromagnetic brake



G. A. HALFvERsdN I ELECTROMAGNETIC BRAKE Filed July 24, 1925 22 g 2 i a. 5 4 s 25 2e WITNESSES: INVENT-OR uafafAa/fa /fiiersan BY WM v Patented Oct. 2,1928. 1 f

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Application filed I111 y 24, 19 25. Serial m. 5,741. 7 My invention relates to brake apparatus brake arm 4 by means of,,a block 13 and'bearand more particularly to electromagnetlc mg 14. Suitable adjusting and locking'nuts brakes, such as are used with electrlc motors 15 are provided, so that the distance between for the control of cranes, elevators and the the brake arms, 2 and 3 may be varied. The

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One object of m invention is provide a 3 and serves as a tension member to support;

brake that 1s simp ein construction, posltivo the brake spring 16, the tension'of which'may 1n 1ts operaton and readily ad ustable. be adjusted in a well-known manner by means Another ob ect of my inventlon is to proof lock-nuts 17. The spring thus operates other eye-bolt 12 is-supported'by brake arm 611 videimeans for "permitting removal of the between the nuts-17' and lug 16a on the 5 brake wheel and motor armature without brake arm 3.

materially disturbmgthe brake assembly. The mean operatin lever 8 is normally Other objects will appear from the follow.- actuated downwardly iv the electromagnet 7 1n dGSCI'lPtlOIl and the appended claims. which, when energized, draws the right-hand hen 1t becomes-necessary to ,remove a brake arm 3 over against an-adjustable stop 7" motor armature from its s for repairs, '18 that is mounted on the magnet housing. 6.- it is very desirable that the bra e mechanism From this position, further downward moveshall be disturbed as little as'possible, for'obment of the lever 8 actuates' the left-handvious reasons. I brake arm s-outwardly by means of the eye- In accordance with my inventiomit is pos-' bolt .11 and in'. t'his manner both shoes are '75 sible to hoist the motor-armature and theatreleased from the brake wheel 19. i tached brake wheel vertically and thereby The assembly of each shoe to the corresave time and expense that would otherwise sponding brake arm is illustrated in Fig. 2. be entailed. The ivotal support for the shoe 2 comprises 2 An important feature of my invention rea b0 t or bearing-sh ft 21 having a shoulder 80 sides in the self alin'ing'brake shoes and the 22' that'is s1i "htl onger than one arm or. means provided for insuring that the shoes section 23 of t es oe casting. When the nut shall properly release the brake wheel when 24 is tightened, the shoulder 22 bearsagainst I the electromagnet is energized. I also prothe brake arm 4 on the one side and, on the vide convenient means for ositioning the 7 other side, the arm and a portion 25 ofthe 85 V housing of the electromagnet, whereby ad- 'shoeqare pressed'together a' spring lockjustments and renewals thereof are'readily washer 26 providing suitable tension. v made. I Thislockmg operation is performed after J My invention be best understood bythe brake has been assembled, as illustrated reference to the accompanying drawing, in in Fig. 1, so that the shoes ahnethems'elyes which i pgoperlywith the brake'wheel. The bearing Fig. 1 isI-a view in side elevation, illus- Its 21 arethus tightened so that, when the trating' the assembled apparatus, and brake arms 3 and 4 are released from the Figs. 2 and 3 are views of certain details wheel, the shoes do not tend-to drag on the 40 of the apparatus illustrated in Fig. 1.. p wheel but 0 crate each as a unlt w th the cor- 95 With referenceto the drawin a pair of responding rake arm. ,g 1 brake shoes "1 and 2 are pivota y mounted Th1s arrangement of the brake shoes is very on brake arms or levers 3 and 4, respe'actively, convenient also when renewals are necessary, which in turn are pivotally mounted on abase since there is but a single self-almmg bear- 5. The base also supports a housing 6 for ing. When 1t becomes necessary to remove 100 the operating magnet 7 which may be of an the-brake wheel and the motor armature (not w oil immersed rany other suitable types shown) stop 18 maybe swung side-wise .to Suitablelink or to gle mechanism is pro-- clear the right-handbrake arm? byloosening vided comprising alever 8 that is 'pivotally the tap bolt 27 suflicientlyto permit the block mouhted' on one of the brake arms 3' and is 28 and stop 18 to be lifted slightly and turned 106 connected by a link 9 to the vertical plunger on this bolt, The main operating lever 8 10 of the operatin magnet 7 The lever 8 is maybe moved downward by a locking nut 29, pivotally attac to a pair of eye-bolts 11 which co-operates-withabolt 29athat extends and-12, which extend in opposite directions, from brake arm 3 throng)e lever 8, and this 66 and one of which is connected to the opposite movement is continued yo'nd the normal 11,0

brake spr' mal a slot-30 in'the V 16 is compressed without disturbing the setting of the brake or the northe a j'ustmgnuts 17. Bearing in31isthen "clamp 32 and tap bolt-83. This assemblyafremoved from the eye-bolt 11' an the eye-bolt is rotated, in' a counter-clockwise direction its left-handbearing 14 in the brake arm. Both brake shoes are now free from the wheel and when, the wheel or armature is lifted vertically, the shoes may also turn slightly on their pivotal bearings 21. v

The method of mounting the magnet housing 6 on the base-5 is such that the housing may be moved transversely and clamped in proper position by means of the bevelled fords means for readily removing the magnet for repairs or renewals.

It will be obvious that a brake designed in accordance'with my invention is convenient in its assembly and the various parts are readily accessible as may-be required, particularly where the brake is mounted upon an over head travelling crane. I have'illust'rated my invention in the preferred form but, of course, various modifications thereof will-naturally occur to one skilled in'theart and I desire scope of the appended claims. 7;

pressure, which is controlled by said wheel, an electromagnet for opposing I claim as my invention 5- 1. In an electroma etic brake,'the combinationwith a air of$rake shoes and a brake wheel, of a -mechanism for actuating the shoes, a spring for biasing said shoes against said bias and manually operable meansfor further releasing said shoes to permit removal of said wheel either axially or transversely. 2. In an electromagnetic brake, the com-. bination with a pair of brake shoes and a brake wheel, of a link-mechanism for actuating the shoes, a spring for biasing said shoes against said wheel, an electromagnet for opposing said bias, and manually operable means for further compressing said spring without disturbing the normal setting of the brake.

3. In an electromagnetic brake, the combination with a pair of brake shoes and a brake wheel, of a pair of arms for supporting said bolt mounted on said arm for-locking said lever to said arm and to furthem bias said spring independently of said magne In testimony whereof, I have hereunto subscribed my name this 21st day of July, 1925.'

,, GUsTa HALFVERSON. Y 

